UITableView not loading data with SwiftyJSON and Alamofire - json

Question

I am trying to parse a json and load it in the CustomTable, my json parsed successful but could not load the data in the UI, i tried adding test datas, and it displayed. So i guess it has to do with scoping. I have tried using other answers on the same question, but still it did not for work me
import UIKit
import Alamofire
import SwiftyJSON
class NewsViewController: UIViewController,
UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var tableView: UITableView!
var newsPosts = [NewsPost]()
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
getNewsPost()
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let post = newsPosts[indexPath.row]
if let cell = tableView.dequeueReusableCell(withIdentifier: "NewsCell") as? NewsPostCell{
cell.configureCell(post: post)
return cell
}else{
let cell = NewsPostCell()
cell.configureCell(post: post)
return cell
}
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return newsPosts.count
}
func getNewsPost(){
Alamofire.request(URL_BASE + NEWS_URL).responseJSON { response in
let json = JSON(data: response.data!)
if let dict = json.dictionaryObject{
if let result = dict["data"] as? [NSDictionary]{
for data in result{
guard let title = data["title"] as? String else{
return print("title is nil")
}
guard let href = data["href"] as? String else{
return print("href is nil")
}
guard let image = data["image"] as? String else{
return print("image is nil")
}
guard let content = data["content"] as? String else{
return print("content is nil")
}
guard let _ = data["timestamp"] as? String else{
return print("timestamp is nil")
}
guard let type = data["type"] as? String else{
return print("type is nil")
}
print(type)
let post = NewsPost(title: title, href: href,
image: image, timestamp:
"1 day ago", content: content, type: type)
self.newsPosts.append(post)
}
self.tableView.reloadData()
}
}
}
}
}

Answer 1

You should test if your tableview is initialized when before you reload the data :
import UIKit
import Alamofire
import SwiftyJSON
class NewsViewController: UIViewController,
UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var tableView: UITableView!
var newsPosts = [NewsPost]()
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
getNewsPost()
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let post = newsPosts[indexPath.row]
if let cell = tableView.dequeueReusableCell(withIdentifier: "NewsCell") as? NewsPostCell{
cell.configureCell(post: post)
return cell
}else{
let cell = NewsPostCell()
cell.configureCell(post: post)
return cell
}
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return newsPosts.count
}
func getNewsPost(){
Alamofire.request(URL_BASE + NEWS_URL).responseJSON { response in
let json = JSON(data: response.data!)
if let dict = json.dictionaryObject{
if let result = dict["data"] as? [NSDictionary]{
for data in result{
guard let title = data["title"] as? String else{
return print("title is nil")
}
guard let href = data["href"] as? String else{
return print("href is nil")
}
guard let image = data["image"] as? String else{
return print("image is nil")
}
guard let content = data["content"] as? String else{
return print("content is nil")
}
guard let _ = data["timestamp"] as? String else{
return print("timestamp is nil")
}
guard let type = data["type"] as? String else{
return print("type is nil")
}
print(type)
let post = NewsPost(title: title, href: href,
image: image, timestamp:
"1 day ago", content: content, type: type)
self.newsPosts.append(post)
}
if self.tableView != nil {
self.tableView.reloadData()
}
}
}
}
}
}

Answer 2

I guess the problem is when you're calling the gettingNewPost function. The reloadData() function is called right after didLoad, maybe you havent even get the data when you call the function to populate the table. Have you tried to log in the cellForRow function to see if isnt trying to access a nil array?

Answer 3

I finally found the issue, one of the guard is return nil, so it stop the execution of others, so i changed from using guard to the below
let title = data["title"] as? String ?? ""
let href = data["href"] as? String ?? ""
let image = data["image"] as? String ?? ""
let content = data["content"] as? String ?? ""
let type = data["type"] as? String ?? ""